/*
 *		INETPEER - A storage for permanent information about peers
 *
 *  Authors:	Andrey V. Savochkin <saw@msu.ru>
 */

#ifndef _NET_INETPEER_H
#define _NET_INETPEER_H

#include <linux/types.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>

struct inet_peer {
	/* group together avl_left,avl_right,v4daddr to speedup lookups */
	struct inet_peer *avl_left, *avl_right;
	__be32 v4daddr;		/* peer's address */
	__u16 avl_height;
	__u16 ip_id_count;	/* IP ID for the next packet */
	struct list_head unused;
	__u32 dtime;		/* the time of last use of not
				 * referenced entries */
	atomic_t refcnt;
	atomic_t rid;		/* Frag reception counter */
	__u32 tcp_ts;
	unsigned long tcp_ts_stamp;
};

void inet_initpeers(void) __init;

/* can be called with or without local BH being disabled */
struct inet_peer *inet_getpeer(__be32 daddr, int create);

/* can be called from BH context or outside */
extern void inet_putpeer(struct inet_peer *p);

extern spinlock_t inet_peer_idlock;
/* can be called with or without local BH being disabled */
static inline __u16 inet_getid(struct inet_peer *p, int more)
{
	__u16 id;

	spin_lock_bh(&inet_peer_idlock);
	id = p->ip_id_count;
	p->ip_id_count += 1 + more;
	spin_unlock_bh(&inet_peer_idlock);
	return id;
}

#endif /* _NET_INETPEER_H */
